Stop mechanism



Aug- 13, 1946- o. J. E. oLs-soN 2,405,709

STOP MECHANISM original Filed Dec. 26, 1940 4s le so ,4e 5|'47 4s 48 v i0; f/

se. 5*1 \35 Be Bs l37 INVENTOR oLov J. .oLssoN ATTORNEY Patented ug. 13, 1946 UNETED STATES ETEN? STOP MECHANSM O lov J. E. Olsson, Minn to Storm Manufacturi neapolis, Minn., a cor :Original application Dcce 371,813. Divided and 'ber 22, 1943,

eapolis, Minn., assigner ng Company, Inc., Minporationof Minnesota.

mber 26, 1940, Serial No. this applicationjDecem- Serial No. 515,272

1o claims. (c1. 19a-143) proved features and characteristics of construction novel both as individual entities of the stop mechanism and in combination with each other.

And a further object is `to provide a stopmechanism `of construction .as hereinafter set `forth.

With `the above objects in View, as well as others which will appear as the specification proceeds, the invention comprises the construction, arrangment and combination of parts as now to be fully described and as hereinafter to be Vspeciiically claimed, it being understood that the disclosure herein is merely illustrative and intended in no way in a llimiting sense, changes in details of construction and arrangement of parts being permissible so long v.as within Athe spirit of the invention and the scope vof the claims which follow.

lIn the accompanying drawing :forming a part of `this specification,

Fig. 1 is a side or end "elevational ViewA of a machine in `which the .features and characteristics of the invention are-incorporated, a grind ing tool supporting .shaft of `the machine being show-n in section;

Fig. 2 is an enlarged fragmentary elevational view, partially in section, of mechanism for controlling operation of themachine .of Fig. 1; a so-called stop mechanism;

Fig. 3 is a detail sectional view of latchmeans of said control mechanism, taken online 3-*3 in Fig. 2;

Fig. 4 is a view corresponding generally .with the disclosure of Fig. 3 vbut showingthe latch means in a different position; and

Fig. 5 is a fragmentary Yelevational View further detailing said latch means.

With respect to the drawing and the ,numerals of reference thereon, a Aframe of the machine, which is a grinding and turning machine, is ,denoted generally at I0. Said frame I 0 rigidly supports an extension portion :I I of the frame which turn rigidly supports an Yelectric motor I2.

The frame Il) also supports a carriage I 3 adapted to be -reciprocated upon the frame Vin 2 direction longitudinally there-of `and ltransversely `of vthe shaft M of the electric motor I2. v.More explicitly, said carriage `I3 `includes ,a .base Aportion I5 thereof slidably movable .overan adjacent surface I of the `frame Ill, and'oppcsitely disposed, oblique -or bevel flange `portions Il thereof slidab-ly movable over oblique -or vbevel surfaces Vof said frame `Ill which are opposite said base portion I5 and said surface LIB. Stated lotherwise, the oppositely disposed, oblique or `bevel flange portions `I.'I, Il are `spaced from the base portion I-6,as well as fromeachcther, and extend inwardly in oblique relation to said base portion I5 to provide oppositelydisposed guideways ofthe carriage I3 extending -longitudinally ofthe framefof the machine in Vwhich opposite side edge portions lof the frame I@ vare snugly, slidably situated. The carriage I3 is adaptedto Abe reciprocated longitudinally of the frame I!) by slidable movement of said carriage and its oppositely disposed gui-deways along the opposite side -edgeportions of said frame.

The carriage I3 supports a .bracket member I 8 adapted to be adjusted transversely -of vthe frame I0 and .perpendicularly to the directionin which said carriage is reciprocable along Asaid frame. The bracket member I8 includes -a base portion-thereof slidably movable over an adjacent usurface of the carriage I 3, land oppositely disposed, oblique or bevel flange portions thereof slidablyfmovable over oblique or bevel surfaces of said carriagewhich are opposite said base portion and l.the carriage'surface. Stated Aotherwise, the oppositely disposed, oblique or bevel ange portions of the bracket member `IS are spaced from the base portion of -said bracket member, as well as from each other, and-'extend inwardly in oblique relation to the base portion of the bracket member, to provide oppositely disposed guidewavs of said bracket member extending transversely of the carriage I3 in which opposite side edge Vportions of said carriage are snugly, slidably situated. The bracket member I8 is adapted to be adjusted transversely of the carriage I3 by slidable movement of said bracket member and its oppositely disposed guideways along the opposite side edge portions of said carriage.

Said bracket member I3 supports, or includes, several, or anumber of, parts of the grindingand turning machine, and vmechanism is included for accomplishing sliding adjustment of the bracket member, with parts .supported thereby, transversely of the carriage, and for causing said spaced relation to and alining relation with said carriage. An adjusting member or screw is rotatably mounted and fixed against longitudinal movement in the arm I9, and an end portion of said adjusting member or screw 2l! is threadably mounted in said side portion of said carriage opposite said electric motor I2. A slot (not shown) in the carriage I3 at the side 0f the last mentioned side portion of said carriage which is opf posite the arm I9 provides clearance for relative movement of the carriage and the adjusting member or screw. Said adjusting member or screw 29 is arranged perpendicularly to said arm I 9 and parallelly of, or alined with, the carriage I3, and the end portion of the adjusting member or screw 20 which is opposite the threaded end portion fixedly supports a hand piece 2I through the instrumentality of which said adjusting member or screw can be rotated, thus to accomplish adjustment of the bracket member I8V transversely of the frame Il! and thecarriage I3. By turning adjustment of the member or screw 20 in one direction, it will be caused to move inwardly of the carriage, thus to cause the bracket member IE to be adjusted inwardly, and by turning adjustment of said member or screw in opposite direction, it will be caused to move outwardly of said carriage, thus to cause said bracket member to be adjusted outwardly. Obviously,the bracket member I8 will be secured in fixed relation to the carriage I3 at any location along the width Vof said carriage 4to which said bracket member may be adjusted.

A work driver, or mechanism for supporting and rotating a brake drum (not shown), or the like, to be ground and turned in the machine, is also included, as Well as is `mechanism for accomplishing reciprocation of the carriage I3, together with the bracket member i8 and the parts supported, or included, by said bracket member, upon the frame I0 and relative to an article, such as a brake drum, to be operated upon. Neither the work driver, or mechanism for supporting and rotating an article to be operated upon, nor the speciiic mechanism for accomplishing reciprocation of the carriage, is a part of the present invention, and, therefore, need not be specifically described. Speaking generally, the driven shaft I4 of the electric motor I2 is operatively connected to cause the article or work to be operated upon to be rotated and also to cause a feedv member or screw 22 of the machine to be rotated selectively in either direction. Said article or work is adapted to be supported in the machine upon an arbor 23 constituted as a part of the work driver, or mechanism for supporting and rotating the article or work, and said electric motor I2 is adapted to cause 'said arbor to be rotated.

The feed member or screw 22 is suitably and conveniently mounted in the frame I0; Means (not shown) is provided for precluding longitudinal movement of the feed member or screw. Said feed member or screw 22 is disposed longitudinallyof said frame Il! and includes an externally threaded portion thereof which meshes with an vinternally threaded portion of the carriage I3. The manner in which the feed member or screw is engaged with the carriage forms no part of the present invention.

Rotation of the feed member or screw 22 selectively in opposite directions is to the purpose of causing the carriage selectively to be fed forwardly or rearwardly, as may be predetermined, relative to an article or work being operated upon. The manner in which said feed member or screw is driven by the electric motor I2 forms l0 no part of the present invention.

A hand wheel (not shown) is fixed upon an end of the feed member or screw 22 to the purpose that manual rotational actuation of said feed member or screw can be accomplished. The construction and arrangement will be such that the feed member or screw can be freely manually rotated in either direction through the medium of said hand wheel when clutch means (not shown) constituted as a part of the driving connection between the electric motor I2 and said feed member or screw is in neutral position.

A cylindrical tool post 24 of the machine is situated at the midwidth of the bracket member i8 and is rotatably supported by said bracket member in upstanding, perpendicular relation thereto. The manner in which the cylindrical tool holder is supported upon the bracket member forms no part of the present invention.

A grinding toolholder of the machine is indicated at 25, and a turning tool holder is denoted at 26. The grinding tool holder and the turning tool holder are so mounted upon the cylindrical tool post 24 that either the Vgrinding tool (not shown) upon a supporting shaft 21 or the turning tool 28 can be brought into engagement with an article or work to be operated upon, such, for example, as the internal surface of a brake drum. 1 Y

The machine includes mechanism, denoted generally at 29, for raising and lowering, or longitudinally moving, the grinding tool holder 25 along the cylindrical tool post 2d. The just mentioned mechanism need not be specifically described. It is no part of the present invention.

The supporting shaft 2'! for the grinding tool is rotatably mounted upon the grinding tool holder 25, and is adapted to be rotated through the instrumentality of a second electricmotor 30 suitably and conveniently supported upon said grinding tool holder 25. A belt 3'I rides a pulley fixed upon the shaft of the electric motor 30 and also rides a pulley fixed upon said supporting shaft 21. A bracket 32 supports the electric motor 3l) upon the grinding tool holder 25.

The electric motors I2 and 30 are adapted to be energized by current from a source (not shown) of electrical energy, and a circuit for said electrical motors is adapted to include an on-andofi switch 33 having an actuating lever 34. Said actuating lever is adapted to be manually moved to the on position of said switch 33, and mechanism for controlling operation of the actuating lever, thus to control operation of the electric motors I2 and30, includes latch means adapted to normally maintain said actuating lever in the closed condition of said switch 33 and cam means for causing said latch means to release the actuating lever 34 for movement to theopen condition of the switch upon movement of the carriage I3 to both its forward and rearward'limit positions.

' The on-and-o'switch 33 having the actuating lever 34 is mounted upon the frame IU. An operating rod 35 for said actuating lever 34 is slidably mounted in spaced apart bearings 36 and 31 upon said frame and is disposed in parallel, adjacent relation to aguideway of the carriage I3. A bifurcated element 3 8 rigid with the operating rod 35 straddles said actuating lever 34, .and a coil compression spring 39 upon said operating rod and between the bearing 31 and a head 4B on the rod 35 has potential tourge Ythe operating rod to position said actuating lever in the off, condition ofsaid switch 33.

`A latch element 4| `is slidably mounted in a cup-shape member 42 rigid with the frame l!) and is disposed transversely of the operating rod 35. A portion of the latchelement at the closed `side of the cup-shape member is notched, as at 43, a portion of said latch element at the open side of said cup-shape member includes a button 4.4, and a coil compression spring 45 upon the latch element and `between the base of the cupshape member and the button 44 normally maintains said button at elevation somewhat above the open end of said cup-shape member.

Spaced apart cams 48 and 41 are adjustably supported, .as at 48, upon a rod 49 xed to the carriage I3 and disposed parallelly of theoperating rod 35. Working surfaces 5B and .5| of said cams 46 and 41, respectively, are in facing yrelation to each other.

The working surface 58 is adapted to cause the button 44 to be depressed against the resilient action Aof :the coil compression spring 45 when the carriage I3 reaches the limit of its rearward' movement, and the working surface 5| is adapted to cause said button 44 to be depressed against the resilient action of said coil compression spring 45 when said carriage reaches the limit of its forward movement. The construction and arrangement are such that when the button 44 is in elevated position, as in Fig. 2, the notched part of the latch element 4| lies in a transverse slot 52 of the operating rod 35 so that the notch 43 is out of alinement with the operating rod, as in Fig. 3, and when said button 44 is depressed by either the working surface 50 of the working surface 5| said notch 43 becomes alined with said operating rod 35, as in Fig. 4. Upon alinement of the notch 43 with the operating rod, the coil compression spring 39 will of course act to move said operating rod longitudinally thus to remove the transverse slot 52 from the location of the latch element 4| and its notch 43.

In practice, as the carriage I3 comes to rest at either of its limit positions the latch element 4| will become depressed by one of the cam working surfaces 5B or 5|, and the operating rod 35 will ybe longitudinally slid by the coil compression spring 39 so that said operating rod will cause said latch element to be held depressed against the action of the coil compression spring 45 while the machine i-S at rest. The longitudinal sliding movement of said operating rod caused by the coil compression spring 39 will of course move the actuating lever 34 to the off condition of the switch 33. When the carriage reaches either of its limit positions, clutch means of the machine will be manually operated to cause the direction of feed of the carriage to be reversed. Then, upon manual actuation of the operating rod 35 inwardly against the resilient action of the coil compression spring 39 to cause the actuating lever 34 to be moved to the on condition of the switch 33, the transverse slot 52 will be alined with the latch element 4| and said latch element obviously will be released from its switch-ofic position as in Fig. 4 to become situated at its switchon position as in Figs. 2 and 3 with the commencement of feeding of the carriage and movement ofthe cam working surface, '50 or 5|, whichrwas in engagement with the button 44 in direction away from said button. .Attention is called to the fact that the button 44 will be released by either of the cam working surfaces 50 or 5| in response -to quite slight -feeding movement of the carriage I3, so that the latch means will cause the actuating lever 34 to be fastened in the on condition of the on-and-ol switch 33 substantially immediately after the electric motor |2 is set in operation. yOf course, either of the cam working surfaces 50 or 5| can be removed from the .button 44 by manual rotation of the hand wheel fixed upon the feed member or screw v22. The switch 33 vcan be placed Ain the circuit of only one off-the electric motors |12 or 3U in an instance where thisy is desirable.

What is claimed is:

1. In combination, a v'irst member, a second member, a device for causing said first and second members t0 "be relatively moved in parallel relation to each other, an operating element upon one of said members, a switch including an acn tuator .upon rthe other of said members, means adapted to be manually actuated to move said actuator to .the on condition of said switch, a resilient member for moving said means to the foi condition of said switch, and mechanism yfor retaining said means `in the .on condition of said switch upon 4manual actuation of said means, said operating element being adapted to actuate said mechanism in response to relative movement of said rst and second members to cause the mechanism to release said means and said resilient member being adapted to move said means to the off condition of said switch when said mechanism is actuated to release said means.

2. In combination, a iirst member, a second member, a device for causing said iirst and second members to be relatively moved in substantially parallel planes, cam means upon one of said members, a switch having an actuator upon the other of said members, mechanism for controlling operation of said actuator including manually actuable means for moving said actuator to the on condition of said switch and latch means for retaining said manually actuable means in the on condition of said switch When said actuator is manually moved to on condition by said manually actuable member, said cam means being adapted to cause said latch means to release said manually actuable means in response to relative movement of said first and second members, and a springfor urging said manually actuable means to the "off condition of said switch when released by said latch means.

3. In combination, a first member, a second member, a device for causing said rst and second members to .be relatively moved in substantially parallel planes, spaced apart cams upon one of said members, a switch having an actuator upon the other of said members, mechanism for controlling operation of said actuator including manually actuable means for moving said actuator to the on condition of said switch and latch means for retaining said manually actuable means in the on condition of said switch when said actuator is manually moved to on condition by said manually actuable means, each of said cams being adapted to cause said latch means to release said manually actuable means in response to relative movement of said rst and second members, and a spring for urging said manually actuable means to the o con-v dition of said switch when released by said latch means.

4. In combination, a iirst member, a second member, a device for causing said first and second members to be relatively moved in substantially parallel planes, cam means upon one of said members, a switch having an actuator upon the other of said members, mechanism for controlling operation of said actuator including manually actuable means for moving said actuator to the on condition of said switch and latch means for retaining said manually actuable means in the on condition of said switch when said actuator is manually moved to on condition by said manually actuable means, said cam means being adapted to cause said latch -means to release said manually actuable means in response to relative movement of said iirst and second members in either direction, and a spring for urging said manually actuable means to the "oi condition of said switch when released by said latch means.

5. In combination, a rst member, a second member, a device for causing Said first and' second members to be relatively moved, cam means upon one of said members, said cam means being constituted as spaced apart cams, a switch having an actuator upon the other of said members, mechanism for controlling operation of said actuator including manually actuable means for moving said actuator to the 8 on condition of said switch and latch means for retaining said manually actuable means in the on condition of said switch when said actuator is manually moved to on condition by said manually actuable means, said cam means being adapted to cause said latch means to release said manually actuable means in response ,to relative movement of said first and second members in either direction, and a spring for urging said manually actuable means to the oi condition of said switch when released .by said latch means.

6. The combination as speciiied in claim 5, and means adjustably supporting said spaced apart cams.

'7. The combination as specified in claim 2, and means for resiliently urging said latch means toward said cam means.

8. The combination as specied in claim 5, and means for resiliently urging said latch means towardsaid cams.

9. The combination as specified in claim 2, wherein said manually actuable means is constituted as an operating rod slidably mounted upon one of said members.

l0. The combination as speciiied in claim 2, wherein said manually actuable means is constituted as an operating rod slidably mounted upon one of said members, and a bifurcated element rigid with said operating rod and arranged in straddling relation to said actuator.

'OLOV J. E. OLSSON. 

